Improvement in steam-boilers



UNITED STATES PATENTNOFFICE.

ROBERT E. ROGERS AND JAMES BLACK, OF PHILADELPHIA, PENN SYVAIA.

IMPROVEMENT IN STEAM-BOILERS.

Specification forming part of Letters Patent No. 41,323, dated January19, 1864.

To @ZZ whom it may concern:

Beit known that we, ROBERT E. ROGERS and J AMES BLACK, both ofPhiladelphia, Pennsylvania, have invented an Improvement inSteam-Boilers; and we do hereby declare the following to be a full,clear, and exact description of the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

Ourinvention consists of a steam-boiler, constructed asdescribedhereinafter, with the view of obtaining an extended heating-surtace, a free circulation of water within the boiler, facilities forrapidly raising the steam and maintaining it at an uniform pressure bythe use of a comparatively small amount of fuel, the boiler being at thesame time simple in construction,

of a form to insure strength, readily secured in its proper positionwithin the {ire-chamber, and easily repaired.

In order to enable others skilled in the construction of steam-boilersto make our invention, we will now proceed to describe its coustructionand operation.

On reference to the accompanying drawings, which form a part of thisspecication, Fig. 1 is a vertical section of our improved steamboiler,and Fig. 2 a sectional plan on the line 1 2, Fig. 1.

A is the body of the boiler, and consists of a hollow vertical cylinder,rounded at the opposite ends.

B B are a series of tubes arranged round the body of the boiler and at ashort distance from the same, each tube being bent at both ends and thebent ends being secured to the body A. Between the tubes B a series ofsimilar, but shorter tubes, B', are arranged round the body of theboiler and secured to the same. By connecting the upper ends of thetubes B to the boiler at points above those where the tubes B aresecured, and by adopting the same plan with the lower ends of the tubes,the piercing of the body of the boiler at points too near each other isavoided, and a great number of tubes are obtained without wounding theboiler.

More tubes than are shown in the drawings might be used. Thus a tubemight be secured to the boiler, the upper end at the point x, and thelower end at the point x', and similar tubes secured at correspondingpoints might be carried round the boiler and secured to the same withoutdiminishing from its strengthin fact, the number of the tubes employedmust depend in a great measure upon the length and diameter of the bodyot' the boiler. v

The boiler with its tubes is shown in the present instance as beingsecured near the top by means of brackets E to the interior of thecylindrical casing D, which has a conical top, F, terminating in thcsmoke-pipe or chimney G.

The casing D is secured to the base H, in which are the grate-bars I,the latter separating the ash-pit J from the fuel-chamber K, both ofwhich are furnished with suitable doors.

It will be evident that the boiler may be suspended within the casing bya variety of appliances-as, for instance, to the conical top byVsuitable links at the lines y, or to the corner of the casing by linksat the lines mand the boiler may be connected laterally to the casing bylight stays. 1n all cases, however, the boiler must be dependent as faras possible for its position within the casing on supports connected tothe boiler at or near the top of the same, the body of the boiler beingotherwise unsupported and being suspended within the casing, so that itsentire surface may be uncovered and exposed to the action ofthe'products of combustion.

The casing D may be composed of brickwork, and the fuel-chamber andash-pit inclosed by brick-work; but itshould be understood that theinterior of the casing must in all cases have direct and opencommunication with the fuel chamberin fact, the latter and the interiorof the casing may be considered as one general fire-chamber, withinwhich `the boiler is suspended.

The tubes B and B maybe vertical, although we prefer to arrange them inthe spiral or inclined position shown, as they tend to direct theproducts of combustion in a spiral course to the chimney, and to therebyincrease their heating action on the boiler.

The advantages of our improved boiler may be enumerated as follows:First, the tubes which are exposed to the direct action of the productsof combustion greatly increase the heatingsurface 5 secondly, the tubesafford a medium for the unif'orm and much desired circulation of waterwithin the boiler; thirdly, by suspending the boiler within atire-chamber and leaving its entire surface exposed to the products ofcombustion, the steam can be raised with great rapidity and maintainedat ar uniform pressure by the use of a comparatively small amount ot'fuel; and fourthly,

We claim as our invention and desire to secure by Letters Patent- 1.rlhe body A of the boiler having; tubes B and B', so arranged that theywill maintain a continuous circulation of Water between the upper andlower portion of the boiler, when the whole or very nearly the Whole ofthe boiler is suspended within a casing containing the re chamber, andis exposed to the direct action of the products of combustion7 assetforth.

2. rlwo or more sets of tubes, B and B', arranged on and attached to thebody A of' the bwiler as set forth, for the purpose set forth.

In testimony whereot` we have signed our names t0 this specification inthe presence of two subscribing witnesses.

R. E. ROGERS. JAMES BLACK. Witnesses:

DAVID BEITLER, SAML. P. JoNEs.

